1 /* $OpenBSD: env.c,v 1.19 2024/07/28 21:44:42 kn Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <err.h> 33 #include <errno.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 39 static void __dead usage(void); 40 41 int 42 main(int argc, char *argv[]) 43 { 44 extern char **environ; 45 extern int optind; 46 char **ep, *p; 47 int ch; 48 49 if (pledge("stdio exec", NULL) == -1) 50 err(1, "pledge"); 51 52 while ((ch = getopt(argc, argv, "iu:-")) != -1) 53 switch(ch) { 54 case '-': /* obsolete */ 55 case 'i': 56 if ((environ = calloc(1, sizeof(char *))) == NULL) 57 err(126, "calloc"); 58 break; 59 case 'u': 60 if (unsetenv(optarg) == -1) 61 err(126, "unsetenv"); 62 break; 63 default: 64 usage(); 65 } 66 argc -= optind; 67 argv += optind; 68 69 for (; *argv && (p = strchr(*argv, '=')); ++argv) { 70 *p++ = '\0'; 71 if (setenv(*argv, p, 1) == -1) { 72 /* reuse 126, it matches the problem most */ 73 err(126, "setenv"); 74 } 75 } 76 77 if (*argv) { 78 /* 79 * return 127 if the command to be run could not be 80 * found; 126 if the command was found but could 81 * not be invoked 82 */ 83 execvp(*argv, argv); 84 err((errno == ENOENT) ? 127 : 126, "%s", *argv); 85 } 86 87 for (ep = environ; *ep; ep++) 88 (void)printf("%s\n", *ep); 89 90 return 0; 91 } 92 93 static void __dead 94 usage(void) 95 { 96 extern char *__progname; 97 98 (void)fprintf(stderr, "usage: %s [-i] [-u name] [name=value ...] " 99 "[utility [argument ...]]\n", __progname); 100 exit(1); 101 } 102